a living, animal monument to the Cold War

From Cecilie Rohwedder in the WSJ...

It has been 20 years since the Berlin Wall fell. But deep in the forest here, a red deer called Ahornia still refuses to cross the old Iron Curtain.

Ahornia inhabits the thickly wooded mountains along what once was the fortified border between West Germany and Czechoslovakia. At the height of the Cold War, a high electric fence, barbed wire and machine-gun-carrying guards cut off Eastern Europe from the Western world. The barriers severed the herds of deer on the two sides as well....

The fence is long gone, and the no-man's land where it stood now is part of Europe's biggest nature preserve....But one species is boycotting the reunified animal kingdom: red deer. Herds of them roam both sides of the old NATO-Warsaw Pact border here but mysteriously turn around when they approach it. This although the deer alive today have no memory of the ominous fence....

In the seven years since wildlife biologists began tracking the deer, only two, a German stag named Florian and a Czech stag incongruously called Izabel, have crossed the border to stay. Lately, some young males have begun to explore the pastures on the other side, but they always come back. Females don't set foot in the once-forbidden area....

One reason, he says, is that deer have traditional trails, passed on through the generations, with a collective memory that their grounds end at the erstwhile barrier. Females, who stay with their mothers longer than males and spend more time absorbing their mothers' movements, stick even more closely to the traditional turf....

It looks like those memories will eventually fade too.